avconv misc

create  video from images

   avconv -r 20 -i in/%05d.png out.avi

to set codec
 -vcoded _codecname_

e.g. (for windows)
 -vcodec msmpeg4v2

to crop (width:height:x:y)
 -vf crop=128:128:20:20

to resize with nearest neighbor:

 avconv -i in.avi -vf scale=512:512:flags=neighbor out.avi